<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 判断字符串的两半是否相似 -->
    <script>
      function halvesAreAlike(s) {
        let count = 0
        for (let i = 0; i < s.length; i++) {
          if (s[i].match(/[aeiou]/i)) {
            i < s.length / 2 ? count++ : count--
          }
        }
        return count === 0
      }
      console.log(halvesAreAlike('textbook'))
    </script>
  </body>
</html>
